Hi I think that, in modern English, it is the difference between a physical property and a mental property. In both cases, it means the ability to stick things together.. - Cyanoacrylate is "superglue" - it has an amazing power of cohesion [= to stick things together] - I tried to understand him but he was drunk - his words had no coherence [= he couldn't stick words or ideas together] I'd say that is the main difference Regards, Dave
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